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8a+7b=249
5a+6b=193
Stiee cineva ???
Va rog


Răspuns :

8a+7b=249; + 5a+6b=193; ___________; 13a+13b=249+193;13(a+b)=442:13;a+b=34,inlocuim:7×34+a=249/-238;;;;a=11;34-11=23(b)